In a periodical of the time, Monthly Review, it was said, "At the house of an Irish nobleman where Geminiani was present, Carolan challenged that eminent composer to a trial of skill.
The musician played on his violin, the fifth concerto of Vivaldi. It was instantly repeated by Carolan on his harp, although he had never heard it before. The surprise of the company was increased when Carolan asserted that he would compose a concerto himself, at that moment.
The more so, when he actually played this admirable piece known ever since as Carolan's Concerto."
This tune is also called Mrs. Power. Mrs. Power, whose maiden name was Elizabeth Keating, was the wife of David Power of Coorheen.

Notations are courtesy of The Life and Times of an Irish Harper by Dónal O'Sullivan.